Fasterfox
Fasterfox is a Mozilla Firefox extension that provides an interface to tweak some performance related settings such as browser network connection, cache, timings, as well as provide an optional controversial feature which forces Link prefetching. These changes can decrease (or if suboptimally set, increase) page loading time. Since 2007, the original extension is not maintained by the developer Tony Gentilcore and is not compatible with Firefox 3.0 or later. As of August 2008, there are alternative extensions that are compatible with Firefox 3.6, such as "Fasterfox" (Rsccman Production)
Read more about Fasterfox.